Packing for grinding-mills.



T. W. GAPEN.

moxme ron GRINDING MILLS.

APPLICATION FILED JULY 13, 1906. I

Patented Jan. 4, 1.910.

2 BHBETBBHBET 1.

INVENTOR WITIV'E SSES:

T. 'w.- GAPBN. PACKING FOE GRINDING MILLS.

APPLICATION FILED JULY 12, 1908.

INVENTOR WITNESSES:

" UNITED STATES PATENT OFFICE- THOMAS W. CAPEN, OF MILWAUKEE, WISCONSIN, ASSIGNOR TO ALLIS-CHALMERS COMPANY, OF MILWAUKEE, WISCONSIN, A CORPORATION OF NEW JERSEY.

PACKING roe GRINDING-MILLS.

Specification of Letters Patent. PatentedJ an. 4', 1910.

Application filed July 12, 1906. Serial No. 325,761.

To all whom 'it may concem:

Be it known that I, THOMAS W. Caren, a

citizen of the United States, residing at Milwaukee, in the county of Milwaukee and State of Wisconsin, have invented a certain new and useful Packing for Grinding-Mills, of which the following is a specification.

This invention relates to packing means especially adapted for grinding mills and the like, and, generally speaking, is intended to provide a fluid packing for such appafratus designed to prevent material under treatment from entering spaces between parts which are movable with respect toeach other.

In the accompanying drawings which form a part oflthis specification and in which the same reference characters are used to designate the same'elements on each of the several figures thereof,Figure 1 represents in section the feed end of an ordinary form of tube mill which is designed to act uponmaterial fed to it in a wet or pasty condition. Fig. 2 is a section, similar to the above, of a form of mill which is adapted to treat a material in a dry state.

The reference character T represents the body of a tube mill which is provided with a head H and the linings Z. The head H is extended to form a tubular bearing t which is supported in the journal box B which rests upon the foundation F.

The reference character G represents the feed tube which is inserted within the trunmen at and which is also supported upon the I foundation F by the base 9 p by means of the pipe P, it will tend to.

Reference character P represents a 'pi e which is adapted to convey a fluid un er pressure into the cavity with which feed tubes G are provided. It will be noticed by reference tothe drawings, that if a fluid" under pressure be introduced into the cavity will pass through the s ace between the trunnion t and the feed tu e G into the body of the tube, and will thus prevent dust and gritty material from passing into said space and thence out into the apartment containing the mill, thus obviating both the discomforts of dust in said apartment, and prolonging the life of the several parts of the apparatus by preventing the destruction of the feeding tube G and trunnion t by the grinding action of the dust which otherwise would collect between them. It will be noticed that the part of the feeding tube G which provides the space p is adapted to inclose the outer surface of the trunnion t,

and that no packing is interposed between these parts in the apparatus shown by Fig. 2,

becapse when air under ressure is used, the

escape of said air into t e apartment is not objectionable. In the apparatus shown by Fig. 1, however, which 18 used for treating material in a Wet or pasty condition, and in which water under pressureis introduced through the pipe P, while the same general arrangement and construction of arts is utilized as in the apparatus shown y Fig. 2, et in this case a packing washer w of the or inary U-sha e in cross section is interposed between t e outer surface of the trunnion t and the part of thefeeding tube G which bears thereon, in order tov prevent the esca e of water into the apartment which won (1 be objectionable.

In the apparatus shown by Fig. 1, the water whic is sulpplied under pressure by means of the tube passes between the inner surface of the trunnion t and the outer surface of the feeding tube G which is prog'ected therein, and thence into the tube 0 the mill, thereby both lubricating said members and preventing dust and grit from entering the space between these members and reventing the destructive action of said ust or rit u on these members.

hat claim is:

, 1. In a mill, the combination of a hollow trunnion a feed tube extending into and loosely fitting said trunnion, and a pipe leading to the space between the said trunnion and the said tube for introducing a fluid under pressure therebetween.

2. In a mill, the combination of a hollow trunnion, a feed tube extending into said trunnion, a cavity formed in the space between the said trunnion and said tube,

and a pipeleading from an exterior source to said, eavity for mtroducing a fluid under pressure therein.

'3. In a mill, trunnion, a feed tube extending into said trunnion, a pipe leading from anoexterior source to the space between said trunnion and said tubefor introducing a fluid under pressure therebetween, and means for reventing leakage of mid fluid around said-trunmon.

4. In a mill, the combination of'a hollow trunnion, a feed tube extending into said trunnion said feed tube being provided with a part extending around the exterior of said trunnion,'a closed cavity formed in the space between the said trunnion and the internal and external extensions oat said tube,and a the combination of a hollow pipe leading to said cavity for introducing a fluid under pressure therein. 1

5. In a mill, the combination of a hollow trunnion, a feed tube extending into said trunnion said feed tube being provided with a partextending around the exterior of said trunnion a closed cavity formed in the space between the said trunnion and the internal and external extensions .of said tube, a pipe leading to said cavity for introducing therem a fluid under ressure, m d a packing member lnterpose between the external extension of said tube and the outside of said" G. F. De WEIN. 

